Jacqueline Collette Gallegos, 28, was killed in 1994, when men pretending to be drug enforcement agents burst into a Denver home. (Handout photo)

Three men have been indicted for murder and attempted murder in a 1994 case police thought had gone cold.

DNA evidence was used to win indictments of Andre "Dre" Jackson, Samuel "Sparky" Sims and Jackie McConnell on multiple counts of murder and attempted murder. Sims and Jackson have also been indicted for sexual assault.

"It sends a message to the community that we are not going to just sit on these cases," Denver District Attorney Mitch Morrissey said. "We're going to continue to work these cases and try to solve them."

Morrissey said called the stabbing deaths of Jacqueline Collette Gallegos, 28, and Nelson E. Swiggett, 42, July 12, 1994, "particularly brutal," and said the case haunted investigators as well as one survivor of the attack, Mack Martinez, who was repeatedly stabbed.

The Denver grand jury handed down the indictment on Dec. 19. All three men are in custody. Sims is currently being held in Wichita, Kansas on other charges.

Police are looking for other men who were involved in the murders and sexual assaults.

As many as six masked men posing as federal drug agents kicked down the door of a home in the 3200 block of Larimer Street, Martinez told police. One of the suspects had a shotgun, according to court records.

According to a court record the suspects heard that Martinez had drugs and money in the home. The suspects demanded to know where drugs and money were hidden.

The men took Martinez into a bedroom and tortured him with a wire hanger and knives. They cut his throat, according to court records. He heard what sounded like three men raping Gallegos in the next bedroom. He heard Swiggett being beaten and begging for his life.

After the killers left the home, Martinez staggered outside and got help.

When police arrived around 4:30 a.m., the house had been ransacked. They found cut pieces of rope, three knives covered with blood and blood all over the house.

The men had sexually assaulted Gallegos, slit her throat and stabbed her 15 or 16 times, her mother Linda Atz told The Denver Post in a 2009 interview for the Colorado Cold Cases blog.

Atz died last May.

"For people to do something like that is almost beyond comprehension," Atz told The Denver Post. She had hopes that at least one of the men who raped her daughter would eventually be arrested and identified through DNA and that he would lead to the other attackers.

"If you do something like this, you're not going to be walking a straight line," Atz said.

Since the 1994 murders, Sims and Jackson both have been charged numerous times for robberies, assaults and drug cases. Jackson was charged in Denver with first degree assault, kidnapping and burglary only 12 days after the murders, according to Colorado Bureau of Investigation records. The disposition of the case is not known.

McConnell allegedly told an acquaintance about the home invasion robbery shortly after it happened. He claimed he didn't kill anyone, only poked them with a coat hanger. He admitted two people died during the robbery.

Jackson also told people about the robbery in July of 1994. He allegedly admitted killing one of the victims but said Sims raped and killed Gallegos.

But DNA samples confirmed that both Sims and Jackson had sexually assaulted Gallegos.

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